Question

今天我开始学习Java而且我被困在这里，我不知道如何使用按钮刷新面板。这是我的代码：

import java.awt.GridLayout;
import java.util.Random;
import javax.swing.*;

public class App {

public static int STR = 0, aPower = 0, sPower = 0, INT = 0, STA = 0, DEF = 0;

private static void GenerateStatus(){
    Random randomGenerator = new Random();
    STR = randomGenerator.nextInt(50);
    aPower = randomGenerator.nextInt(50);
    sPower = randomGenerator.nextInt(50);
    INT = randomGenerator.nextInt(50);
    STA = randomGenerator.nextInt(50);
    DEF = randomGenerator.nextInt(50);
}

private static void FirstTimeInGame() {
    String[] items = {"Warrior", "Mage", "Druid", "Scout"};
    JComboBox combo = new JComboBox(items);
    JTextField Name = new JTextField();
    JPanel panel = new JPanel(new GridLayout(0, 1));

    GenerateStatus();

    panel.add(new JLabel("Name", SwingConstants.CENTER));
    panel.add(Name);
    panel.add(new JLabel("Class", SwingConstants.CENTER));
    panel.add(combo);
    panel.add(new JLabel("Stats", SwingConstants.CENTER));
    panel.add(new JLabel("Strength           " + STR));
    panel.add(new JLabel("Attack Power  " + aPower));
    panel.add(new JLabel("Spell Power     " + sPower));
    panel.add(new JLabel("Intellect            " + INT));
    panel.add(new JLabel("Stamina            " + STA));
    panel.add(new JLabel("Armor               " + DEF));

    String[] buttons = {"Create!", "Randomize!", "Cancel"};

    int result = JOptionPane.showOptionDialog(null,
            panel,
            "Welcome",
            JOptionPane.YES_NO_CANCEL_OPTION,
            JOptionPane.PLAIN_MESSAGE,
            null,
            buttons,
            buttons[2]
            );

    if (result == JOptionPane.OK_OPTION) {
        System.out.println(combo.getSelectedItem()
                + " " + Name.getText());
    }
    else if (result == JOptionPane.NO_OPTION){
        GenerateStatus();
        panel.validate();
        panel.repaint();

    }
    else{
        System.out.println("CANCEL");
    }

}

public static void main(String[] args) {
    FirstTimeInGame();
}
}

函数GenerateStatus（）生成随机数。当我按下按钮＆＃39;随机化！＆＃39;窗户正在关闭 enter image description here

任何人都可以帮助我吗？请？

Answer 1

您不需要将JLabel添加到面板，而是需要将它们存储在类级别成员中。单击按钮时，需要更改现有标签中的文本。

在此附近：

public static int STR = 0, aPower = 0, sPower = 0, INT = 0, STA = 0, DEF = 0;

添加

private JLabel strLabel;

然后panel.add(new JLabel("Strength " + STR));变为

strLabel = new JLabel("Strength           " + STR);
panel.add(strLabel);

现在，您可以从其他地方更改strLabel的文字。

使用其他值刷新JPanel

1 个答案: